亚洲夏季风区中尺度地形降水结构及分布特征  

Structure and Distribution of Rainfall over Mesoscale Mountains in the Asian Summer Monsoon Region

作　　者：朱素行[1] 徐海明[1] 徐蜜蜜[1] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,南京210044

出　　处：《大气科学》2010年第1期71-82,共12页Chinese Journal of Atmospheric Sciences

基　　金：国家重点基础研究发展规划项目2006CB403607;2004CB418301;国家自然科学基金资助项目40575045;江苏省研究生培养创新工程CX08B_020Z

摘　　要：采用高分辨率TRMM、AIRS卫星实测资料,从气候态的降水微物理过程角度分析了亚洲夏季风期间中尺度山脉对不同性质降水垂直结构和水平分布的影响。研究表明,中尺度山脉迎风、背风坡均以层云降水为主,层云降水强度在迎风坡强于背风坡;对流降水在迎风坡主要为浅对流,背风坡主要为深对流,对流降水强度在背风坡强于迎风坡。沿西南季风推进方向依次经过的中尺度山脉,其两侧发生降水像素个数、降水微物理特征等差异逐渐减小,其中,对流降水迎风坡向背风坡转变明显,而层云降水背风坡向迎风坡转变明显。大气稳定度与对流降水在迎风、背风坡的分布相一致。另外,对中尺度地形降水的研究为区域气候模式模拟高精度地形降水分布提供了实测依据。High-resolution satellite observation data TRMM and AIRS are used to analyze the effect of mesoscale mountains on vertical structure and horizontal distribution of different types of rainfall during the Asian summer monsoon region from the perspective of climatological rainfall microphysical processes. It was found that the strati form precipitation is the predominant rainfall type on both the windward and leeward sides of mesoscale mountains, and the rainfall on the windward side is stronger than that on the other side. In the meanwhile, the convective precipitation is mainly shallow convective precipitation on the windward side and deep convective precipitation on the leeward side, and the leeward rainfall is stronger. The results also demonstrate that along the direction followed by the southwest monsoon, the discrepancies of rainfall pixel numbers and microphysical processes between both the sides of mesoscale mountains reduce gradually. During the whole process, the convective precipitation changes from the windward side to the leeward side distinety, the stratiform precipitation is just the opposite. Also, atmospheric stability corresponds well to the convective precipitation on both the sides. In addition, this research on mesoscale orographic precipitation can provide a robust basis for the simulation of high-resolution terrain rainfall in regional climate models.

关 键 词：不同性质降水 中尺度地形 亚洲夏季风 

分 类 号：P426[天文地球—大气科学及气象学]